Tokyo topographic maps

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The island is a stratovolcano with a granitic composite cone, dating from the late Pleistocene period, between 10,000 and 2,000 years ago. The island has a roughly circular coastline, 88.3 kilometers in length, with an average diameter of eight kilometers. The highest elevation Mount Oyama (雄山, Oyama-san)…

Average elevation: 551 ft

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